EP2886298A1 - Vorrichtung zum Thermoformen von Kunststoffplatten - Google Patents

Vorrichtung zum Thermoformen von Kunststoffplatten Download PDF

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Publication number
EP2886298A1
EP2886298A1 EP14197504.5A EP14197504A EP2886298A1 EP 2886298 A1 EP2886298 A1 EP 2886298A1 EP 14197504 A EP14197504 A EP 14197504A EP 2886298 A1 EP2886298 A1 EP 2886298A1
Authority
EP
European Patent Office
Prior art keywords
shoulder
distance
frame
seal
bell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14197504.5A
Other languages
English (en)
French (fr)
Other versions
EP2886298B1 (de
Inventor
Simone Dr. Sertori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
COMI SpA
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COMI SpA
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Filing date
Publication date
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Publication of EP2886298A1 publication Critical patent/EP2886298A1/de
Application granted granted Critical
Publication of EP2886298B1 publication Critical patent/EP2886298B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/30—Moulds
    • B29C51/303—Moulds with sealing means or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/006—Using vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/007—Using fluid under pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/10—Forming by pressure difference, e.g. vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/74—Domestic articles
    • B29L2031/7404—Dishes

Definitions

  • the present invention refers to the field concerning devices for vacuum thermoforming in the inner mold and for overpressure thermoforming in the outer mold of plates in thermoplastic material and in particular refers to a device for the thermoforming of plastic sheets with adjustment and with a pneumatic seal to compensate differences in thickness of the materials, equipment, tolerances and irregularities.
  • thermoplastic sheets forming whose upper part is equipped with a bell in which the pressure can be brought to negative values by suction means.
  • Such bell is supported by an upper frame with removable locks for attachment of an upper framework, lying on a horizontal plane, which abuts with the lower opening of the bell.
  • a pneumatic air tight seal prevents leaking between the mouth of the bell and the top frame.
  • Such known devices also include a lower framework placed horizontally under the upper one of which reproduces the shape in plan; said lower framework is connectable by removable lock means to a proper frame vertically movable by the action of respective actuators.
  • a conveyor for example of chains kind, transports the plasticized plates between the upper and lower frameworks that mutually approaching can tighten the plate.
  • a lower frame placed below the upper one and the frameworks, supports a forming mold of the plate.
  • the upper frame bears closing means, for example consisting of stems vertical column shaped whose free ends bear respective first connecting means for corresponding second connecting means rigidly fixed to the second frame.
  • the second connecting means of the second frame allow to lock or release the first connecting means and then to release the upper and lower frames, for example to allow the tooling phases.
  • Suitable actuators for the vertical translation of the closing means allow to mutually approach and separate the two upper and lower frames, according to the operation cycle of such known devices.
  • One object of the present invention is to propose a device able to place the upper and lower frames to two or more predefined and predetermined mutual distances.
  • Another object is to propose a device that ensures the pneumatic sealing of the bell mouth via a seal able to compensate the variations or irregularities of the distance of the bell mouth, also in a dynamic way and to adapt to the intense forces and stresses to which it is subjected.
  • numeral 1 indicates the device for plastic plates thermoforming in thermoplastic material, for example ABS or HIPS, object of the present invention.
  • the device comprises a bell means 3, in which the pressure can be brought to negative values by suction means and to positive values by pressurization devices, and a first upper frame means 4, which supports the bell means 3 and vertically movable by effect of respective actuators.
  • the first frame means 4 is provided with lock means 6 for the removable fixing of a first framework means 7 usually placed in the upper portion of the device, lying on a horizontal plane and usually abutting with the lower opening of the bell means by the interposition of a seal means 8, assigned to prevent the air passages between the first frame means 4 and the first framework means 7.
  • the device 1 also comprises a second framework means 9 e horizontal and lower with respect to the first 7 of which reproduces the plan shape that is generally rectangular.
  • a conveyor of known type and not illustrated, for example pliers or chains kind, translates the plasticized plates and placing them between the first 7 and second 9 framework means that approaching each other, by effect of vertical translational actuators, tighten the interposed plate that thus closes the mouth of the bell means inside which, thanks to the suction air with forming of depression, forms the "balloon" made by the plate deformed and sucked into the bell means.
  • the device 1 comprises a plurality of column means 15 of vertical cylinders shaped, each having the upper end fixed to the first frame means 4 and the lower end provided with a respective first connecting means 17 removably lockable to a corresponding second connecting means 18 fixed to the second frame means 11. Said locking occurs during the plate forming.
  • Each first connecting means 17 is provided with a plurality of shoulder means 20, 21 facing upwards and placed at a predetermined mutual distance.
  • Each second connecting means 18 is provided, for each of shoulder means 20, 21, with at least one, preferably two, corresponding bolt means 23, 24 sliding horizontally towards and away from the respective first connecting means 17.
  • Each bolt means 23, 24 is provided with a respective matching surface 26, 27 facing downwards and is translated by a corresponding actuator to abut alternately the respective shoulder means 20, 21.
  • the matching surfaces 26, 27 are placed at a mutual distance equal to the predetermined mutual distance between the shoulder means 20, 21 to which last distance was subtracted or added a predetermined length of distance adjustment (or setting distance) between the first 4 and second 11 frame means.
  • first 17 and second 18 connecting means will be mutually fixed in a first position corresponding to a normal position of the first frame means 4 locked to the second frame means 11 and alternatively said connecting means 17, 18 can be mutually fixed in a second position corresponding to an increased distance, for example, of 4 mm with respect to the normal distance between the first 4 and second 11 frame means mutually locked.
  • the second and increased distance allows, for example, to use an upper framework means 7 with increased height.
  • Said shoulder means 20, 21 consist of upper, horizontal and annulus surfaces of respective annular extensions or annular flanges made or secured to the lower ends of the column means 15.
  • the matching surface 26, 27 are annulus horizontal sectors forming an integral part of the bolt means 23, 24 which are, for example, in the form of a sector of the toroidal element.
  • Each bolt means 23, 24 is actuated by a respective actuator of pneumatic cylinder 29 type with stem radially oriented with respect to the longitudinal axis of the corresponding column means 15 and fixed to the median portion of its bolt means 23, 24.
  • the shoulder means 20, 21 are two and the bolt means 23, 24 are four but it is expected that such quantities can be multiplied by integers so as to obtain proportional increases of the possible reciprocal positions of the first 4 and second 11 frame means 11 when are mutually fixed.
  • the first shoulder means 20 is spaced from the second shoulder means 21 of a first distance and the couple of first matching surfaces 26 is spaced from the couple of second matching surfaces 27 of a second distance; the modulus, or absolute value, of the difference between said distances first and second is equal to the adjustment lengths between the first 4 and second (11) frame means.
  • the difference between the distance that separates the matching surfaces 26, 27 and the distance that separates the shoulder means 20, 21, corresponding to the thickness adjustment is about 4 mm, but such measure can be easily adapted to the various needs.
  • the bottom of the annular housing 25 has a channel 31, for example consisting of a further and more small groove, for a pressurized fluid fed through at least one supply duct 32 in flow communication with a pressurized fluid source.
  • a pressurized fluid fed through at least one supply duct 32 in flow communication with a pressurized fluid source.
  • Such fluid transmits to the seal means a homogeneous pressure to the outside of the annular seat.
  • the cross sections of the annular housing 25 and the seal means 8 are approximately rectangular and show, respectively, depth and height such as to enable the almost total entry of the seal means in the annular housing and the protrusion of the seal means outward the annular housing.
  • the seal means 8 is annular shaped and its portion protruding from the seat is flat or rounded and it is assigned to abut with a top flat face of a peripheral flange of the first framework means 7.
  • the seal means 8 sides bear respective longitudinal protrusions assigned to statically or slidably abut with the sides of the annular housing 25.
  • the portion of the seal means 8 facing the bottom of the annular housing 25 bears two longitudinal divergent winglets.
  • Such protrusions and longitudinal winglets improve the sealing of the pressurized fluid between the seal means 8 and the annular housing 25 by the external extroversion of the winglets caused by the pressurized fluid acting on the inner surface of the winglets themselves.
  • the operation of the device thanks to the synergy that develops between the system of adjustable mutual locking of the first 4 and second 11 frame means and the particular adaptive configuration of the seal means, guarantees the perfect pneumatic seal of the bell means even in presence of stresses caused by irregularities and tolerances, to the use of plates with different and irregular thicknesses or by inhomogeneity of the forces applied by the actuators, in addition as seen, the invention allows to adopt upper frames with different thicknesses.
  • the invention advantageously allows to avoid that the seal means 8 is broken because pinched by the frame so consequently losing its sealing function.
  • An advantage of the present invention is to provide a device able to place the upper and lower frames to two or more predefined and predetermined mutual distances.
  • a further advantage consists in the possibility of forming with pressure equal to or greater than two bars inside the bell, without the need of having to press against one another the two upper and lower frames.
  • Another advantage consists in the possibility to fit in the machine and use also deformed or out of nominal measures upper frames without compromising the operation and productivity of the machine.
  • a further advantage consists in the fact that any "pinching" of the seal don't compromise the functionality since they don't cause the breaking.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Details Of Cutting Devices (AREA)
EP14197504.5A 2013-12-20 2014-12-11 Vorrichtung zum Thermoformen von Kunststoffplatten Active EP2886298B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000700A ITBO20130700A1 (it) 2013-12-20 2013-12-20 Dispositivo per la termoformatura di lastre in materiale plastico

Publications (2)

Publication Number Publication Date
EP2886298A1 true EP2886298A1 (de) 2015-06-24
EP2886298B1 EP2886298B1 (de) 2016-08-31

Family

ID=50001094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14197504.5A Active EP2886298B1 (de) 2013-12-20 2014-12-11 Vorrichtung zum Thermoformen von Kunststoffplatten

Country Status (4)

Country Link
US (1) US20150174814A1 (de)
EP (1) EP2886298B1 (de)
CN (1) CN104723543A (de)
IT (1) ITBO20130700A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001043947A1 (de) * 1999-12-17 2001-06-21 Rohrer Ag Verfahren und vorrichtung zur herstellung von verpackungen, ohne die folie zu heizen
DE102005039691A1 (de) * 2005-04-19 2006-10-26 Gerhard Schubert Gmbh Pressantrieb
US20130119584A1 (en) * 2011-11-14 2013-05-16 Irwin Research And Development, Inc. Thermoforming Machine Having Platen Locks and Method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5217563A (en) * 1988-12-01 1993-06-08 Bayer Aktiengesellschaft Apparatus for producing a deep-drawn formed plastic piece
DE10009405A1 (de) * 2000-02-28 2001-08-30 Kiefel Gmbh Paul Vorrichtung zum Verformen von thermoplastischen Materialien
JP2005053022A (ja) * 2003-08-01 2005-03-03 Meiki Co Ltd 型締装置および型締方法
US7404920B2 (en) * 2006-03-06 2008-07-29 Husky Injection Molding Systems Ltd. Molding-system clamp assembly
US7963759B1 (en) * 2006-11-29 2011-06-21 Custom Products Enterprises, Inc. Mold base hold retainer and method of using

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001043947A1 (de) * 1999-12-17 2001-06-21 Rohrer Ag Verfahren und vorrichtung zur herstellung von verpackungen, ohne die folie zu heizen
DE102005039691A1 (de) * 2005-04-19 2006-10-26 Gerhard Schubert Gmbh Pressantrieb
US20130119584A1 (en) * 2011-11-14 2013-05-16 Irwin Research And Development, Inc. Thermoforming Machine Having Platen Locks and Method

Also Published As

Publication number Publication date
ITBO20130700A1 (it) 2015-06-21
EP2886298B1 (de) 2016-08-31
CN104723543A (zh) 2015-06-24
US20150174814A1 (en) 2015-06-25

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